6.1.1 Push button panels

The arrangement of a number of push buttons into one group can be done with a
push-button-panel
. Since this provides a panel of buttons which do not maintain a selection when you click on them,
push-button-panel
is a
choice
that does not allow a selection. When a button is activated it causes a
:selection-callback
, but the button does not maintain the selected state.

Here is an example of a push button panel:

(make-instance 'push-button-panel

:items '(one two three four five)

:selection-callback 'test-callback

:print-function 'string-capitalize)

(contain *)

Figure 6.1 A push button panel

The layout of a button panel (for instance, whether items are listed vertically or horizontally) can be specified using the
:layout-class keyword. This can take two values:
'column-layout if you wish buttons to be listed vertically, and
'row-layout if you wish them to be listed horizontally. The default value is
'row-layout
. If you define your own layout classes, you can also use these as values to
:layout-class
. Layouts, which apply to many other CAPI objects, are discussed in detail in Laying Out CAPI Panes.